thats an important additional information – that you have transparency header!
Anyway – it will be better to have your page to give you better advice

you see here a test page with transparency header – you can even style the background-colors on the same toggle class:https://webers-testseite.de/elegant/con-tact/

Well you can use the enfold option for header : logo top menu below.
Then the menu is in an extra div with ID: header_main_alternate

the offset of 130 px here on my example depends on your given header height and if you are using a header_meta.
On my example page i got a header-height of 100px plus the header_meta of aprox. 30px
this comes to child theme functions.php:

function scroll_up_down_change() {
?>
<script>
(function($){	
$(document).on("scroll", function() {
  if ($(document).scrollTop() > 130) {
    $("#header_main_alternate").addClass("sticky");
  } else {
    $("#header_main_alternate").removeClass("sticky")
  }
});
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'scroll_up_down_change');

this comes to quick css f.e.:

#header_main_alternate.sticky{
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    box-shadow: 0 5px 25px #aaa;
    transition: box-shadow 0.5s ease;
}

this is how it looks like: https://webers-testseite.de/elegant/

Did you see the date of the post? September 13, 2018
This is long time ago – and all the nice addenda to influence the playback have been deleted by Google – although some of them are still listed in their link.
Most mobile devices do not autoplay videos on default – or do not play if it is not muted.

by the way have you ever tested that button on the upper right corner?
sticky elements on scrolling down !

try it this way:
and copy paste please – if participants don’t use the code tag it is hard to inspect if you are using correct Quotationmarks

add_filter('avf_datepicker_dateformat', 'new_date_format');
function new_date_format() {
$date_format = "mm / dd / yy";
return $date_format;
}

add_filter('avf_datepicker_date_placeholder', 'new_date_placeholder');
function new_date_placeholder() {
$placeholder = "MM / DD / YY";
return $placeholder;
}

It would be nicer to have the link where you created it, and I could work on implementing the appropriate changes.

is there a page or site you can show us as an example. Maybe the page you are speaking about – and if not – maybe one page from enfold demo site?

f.e.: https://kriesi.at/themes/enfold-2017/elements/tables/
where would you like to change something?

read here somthing in additon: https://kriesi.at/documentation/enfold/search/

for example to use instead relevansi search

Edit : use the other method – it is much easier to understand Link

you can insert on different ways a search icon to the navigation via child-theme functions.php

f.e:

add_filter( 'wp_nav_menu_items', 'avia_append_search_nav', 10, 2 );
function avia_append_search_nav ( $items, $args )
{
    if ((is_object($args) && $args->theme_location == 'avia') || (is_string($args) && $args = "fallback_menu"))
      {
          global $avia_config;
          ob_start();
          get_search_form();
          $form =  htmlspecialchars(ob_get_clean()) ;

          $items .= '<li id="menu-item-search" class="noMobile menu-item menu-item-search-dropdown menu-item-avia-special">
                 <a href="?s=" data-avia-search-tooltip="'.$form.'" '.av_icon_string('search').'>
                  <span class="avia_hidden_link_text">'.__('Search','avia_framework').'</span>
                 </a>
               </li>';
      }
      return $items;
}

Rest is a little bit of styling via quick css f.e. that little white arrow etc.

But be shure that your date format is the same way.

Bitte frage dann aber auch so ab. Nicht das dort die Reihenfolge dann anderst ist.!
Dort muss schon das DD / MM / YY stehen bleiben, aber der Placeholder kann so verändert werden
Dieses hier in die child-theme functions.php:

add_filter('avf_datepicker_date_placeholder', 'new_date_placeholder');
function new_date_placeholder() {
$placeholder = "TT / MM / JJ";
return $placeholder;
}

by the way – you can change the prev – next text with just some Quick Css lines:

#top .avia-datepicker-div.ui-datepicker .ui-datepicker-prev span, #top .avia-datepicker-div.ui-datepicker .ui-datepicker-next span {
    color: transparent;
}

a.ui-datepicker-prev.ui-corner-all:before {
    content: 'zurück';
    display: block;
}

a.ui-datepicker-next.ui-corner-all:before {
    content: 'vor';
    display: block;
}

Or use signs as << and >>

you have on that place in your page used a plugin to generate these three buttons: “E-Mail, Name, Subscribe”
these three butttons are in a container which has a margin-bottom value of 20px.
If you colorize your enfold columns – you can see that they have same height – but do not center vertically the content (apparently) but they are centered (including the margin-bottom value).
try this to your quick css:

#top .thrv_lead_generation_container form {
    margin-bottom: 0 !important;
}

What causes the set properties to jump back to the default values I cannot say. But I see that the columns already have the same height on your site

Das ist ja auch richtig so! Denn was sagt das Wort Redakteur aus?
Alle Inhalte können bearbeitet werden – fremde und eigene Inhalte – Alles Andere soll nicht im Einfluss eines Redakteures liegen.
Du lässt einen Redakteur einer Zeitschrift ja auch nicht an die Druckmaschinen ran – oder?

Es gibt wohl einige Plugins, die eine gezielte Benutzerrolle anlegen können. Wo der Adminitrator die Dinge die eine Rolle bearbeiten darf gezielt setzen kann.
______

That’s just as well! Because what does the word editor mean?
All contents can be edited – foreign and own contents – everything else should not be under the influence of an editor.
You don’t let an editor of a magazine touch the printing presses – do you?

There are probably some plugins that can create a specific user-role, where the administrator can set the things a role is allowed to edit.